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Citation: JIN Ying, SU Zhaohui. Water Diffusion in Polycarbonate Film Studied by 2D FTIR Spectroscopy[J]. Chinese Journal of Applied Chemistry, ;2011, 28(1): 16-21. doi: 10.3724/SP.J.1095.2011.00226 shu

Water Diffusion in Polycarbonate Film Studied by 2D FTIR Spectroscopy

JIN Ying ,
SU Zhaohui ^,

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: SU Zhaohui,
Received Date: 16 April 2010
Available Online: 8 July 2010
Fund Project: 国家自然科学基金创新研究群体科学基金(50921062)资助项目 (50921062)

The diffusion of water into polycarbonate film was investigated by attenuated-total-reflection Fourier transform infrared (ATR-FTIR) spectroscopy. Via band deconvolution in the O-H bending region, three components were identified, which were located at 1669, 1648 and 1623 cm^-1, respectively, whereas in the O-H stretching region, three bands at 3562, 3423 and 3246 cm^-1, respectively were isolated. These results indicate the presence of three states of water molecules in the polycarbonate matrix:strong, moderate, and weak hydrogen-bonded water. Two dimensional correlation analysis of the IR data further confirmed the presence of the three states, and revealed the sequence of the formation of the three types of hydrogen bonding. Based on these experimental results, we concluded that when water diffuses into polycarbonate matrix, it first forms moderate hydrogen bond with the carbonyl group(i. e. the water bound to the carbonyl), followed by the formation of strong hydrogen bonds due to a water molecule bridging a carbonyl and another carbonyl or water molecule, and weak hydrogen bond between water molecules in microvoids.
- water diffusion,
- polycarbonate,
- FTIR,
- 2D correlation analysis
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